Meaning of “gas mask” in the English Dictionary

american-english dictionary

"gas mask" in British English

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(Definition of “gas mask” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"gas mask" in American English

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a device a person wears over the face to protect against breathing in poisonous gases

(Definition of “gas mask” from the Cambridge Academic Content Dictionary © Cambridge University Press)